Bonobos Are a Close Primate Relative to Humans, Sharing 98

Bonobos are a close primate relative to humans, sharing 98 percent of human DNA.Bonobos are particularly interesting to use when studying aggression because they are

A) highly aggressive primates who are known to brutally attack one another.
B) led by a male hierarchy.
C) very peaceful and led by a female hierarchy.
D) the only other animal with the hormone testosterone.